A species of Mexican fish amasses in reproductive orgies so loud they can deafen other sea animals, awed scientists said Wednesday, calling for preservation of the "spectacle" threatened by overfishing.

A step forward in the gene-editing technique known as CRISPR/Cas9 suggests some diseases like diabetes and muscular dystrophy may be reversible, according to research involving lab mice published Thursday.

He is a tourist attraction worth travelling a long way to see -- Jonathan the giant tortoise is perhaps the world's oldest land animal, living in pampered luxury on the remote British island of St. Helena.